myth·o·ma·ni·a (m?th??-m??n?-?, -m?n?y?)n. A compulsion to embroider the truth, engage in exaggeration, or tell lies.myth?o·ma?ni·ac? (-?k?) n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.mythomania (?m?????me?n??) n (Psychiatry) psychiatry the tendency to lie, exaggerate, or relate incredible imaginary adventures as if they had really happened, occurring in some mental disorders mythomaniac n, adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014myth?o?ma?ni?a (?m?? ??me? ni ?) n. lying or exaggerating to an abnormal degree. [1905?10] myth`o?ma?ni?ac`, n., adj. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.mythomaniaPsychiatry. an abnormal propensity to lie, exaggerate, or twist the truth.See also: Lies and Lying-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.